Number of (n+1) X (n+1) 0..1 arrays with no 2 X 2 subblock having zero or two 1's.
A251211
Number of (n+1) X (n+1) 0..1 arrays with no 2 X 2 subblock having zero or two 1's.
Terms
- a(0) =9a(1) =63a(2) =758a(3) =16911a(4) =666522a(5) =48781920a(6) =6424279907
External references
- oeis: A251211